Nearly a dozen circus animals roamed along a northern Indiana highway in the early hours of Saturday after they were safely rescued from a truck fire, authorities said. The incident occurred on Interstate 69 in Grant County, roughly 60 miles northeast of Indianapolis. A tractor-trailer carrying zebras and camels from Florida to Fort Wayne for a series of weekend performances was engulfed in flames when a state trooper spotted it just after 2 a.m. Once the trooper saw the driver, a 57-year-old man from Sarasota, Florida, had safely exited the vehicle, he entered the trailer to rescue the animal…